JP2015126415A - Electronic apparatus, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow power control between apparatuses sharing a medium content via a network.SOLUTION: When the operation power source of an electronic apparatus is not an external power source, the electronic apparatus generates a list by adding a content for power control to providable contents, and transmits the list to an external apparatus. When a request for transmission received from the external apparatus on the basis of the list is a request for transmission of the content for power control, the electronic apparatus controls power supply at the electronic apparatus.

Description

  The present invention relates to an electronic device, a control method, and a program, and more particularly to a media content sharing technique via a network.

  In recent years, guidelines for sharing digital media content such as still images, moving images, audio, and the like between devices of different manufacturers have been defined by the Digital Living Network Alliance (DLNA) and are widely used. In the DLNA guidelines, an entity that shares content so that it can be transmitted is defined as a digital media server (DMS), and an entity that receives and plays back content is defined as a digital media player (DMP). That is, as long as the products comply with DMS and DMP defined by the DLNA guidelines, it is possible to search and reproduce the content provided by DMS in DMP.

  Conventionally, products that use a commercial power source such as a TV recording device and a network-compatible storage device have been mainly used as products that comply with DMS. However, in recent years, there are also products compliant with DMS among portable devices using a battery power source as an operation power source such as a mobile phone, a digital camera, and a digital camera. Japanese Patent Application Laid-Open No. 2004-228561 discloses an imaging apparatus compliant with DMS that can be controlled by an external device.

JP 2011-29917 A

  By the way, when reproducing the content provided by the DMS in the DMP, it is assumed that the DMS is in an activated state. That is, the user needs to keep the DMS activated when reproducing the content provided by the DMS using the DMP.

  A DMS that uses a conventional commercial power supply as an operating power supply can always be in an activated state. However, when the DMS is a portable device that uses a battery power source as an operating power source as in Patent Document 1, it is not realistic to leave the device in an activated state for a long time. That is, since it is generally assumed that portable devices are used for purposes other than functioning as a DMS, it is not preferable to consume battery power unnecessarily in order to function as a DMS. For this reason, after the user finishes the content reproduction in the DMP, the user needs to change the portable device functioning as the DMS from the activated state to the deactivated state.

  However, in the DLNA guidelines, a content reproduction method is defined, but a power control method for content reproduction is not defined. In other words, the user needs to change the non-activated state by directly operating the portable device that has been functioning as the DMS after finishing the content reproduction in the DMP.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an electronic device, a control method, and a program capable of controlling power between devices that share media content via a network. To do.

  In order to achieve the above object, an electronic apparatus according to the present invention is characterized by having the following configuration. Specifically, the electronic device is an electronic device that transmits a list of contents that can be provided to the external device and receives a content transmission request from the external device based on the list, and a generation unit that generates the list, and a generation unit Communication means for transmitting the list generated by the above, receiving a transmission request, determination means for determining the operating power of the electronic device, and control means for controlling the power supply in the electronic device, the generating means, When the operating power source determined by the determining unit is not an external power source, a list is generated in addition to the content capable of providing power control content, and the control unit receives the transmission request received by the communication unit for power control. In the case of a content transmission request, the power supply in the electronic device is controlled.

  With such a configuration, according to the present invention, it is possible to control power between devices that share media content via a network.

The figure which showed the system configuration | structure of the content sharing system which concerns on Embodiment 1 of this invention, and the modifications 1 and 2 The block diagram which showed the function structure of DVC101 which concerns on embodiment of this invention The block diagram which showed the mechanism structure of DTV102 which concerns on embodiment of this invention. The flowchart which illustrated the content sharing process performed by DVC101 which concerns on Embodiment 1 of this invention The figure which illustrated the hierarchical structure of the shared content in the recording medium connected to DVC101 which concerns on embodiment of this invention The figure which illustrated the participation notification message and the leaving notification message in the DLNA network The figure which showed the example of a description of the content list transmitted when it is operate | moving with internal power supply from DVC101 which concerns on embodiment of this invention. The figure which showed the example of a description of the content list transmitted when operate | moving with the external power supply from DVC101 which concerns on embodiment of this invention The figure which showed the example of the list screen displayed when it is operate | moving by internal power supply from DVC101 which concerns on embodiment of this invention. The figure which showed the example of the list screen displayed when operate | moving with the external power supply from DVC101 which concerns on embodiment of this invention The figure which showed the example of a screen transmitted according to the transmission request | requirement of the content for power control from DVC101 which concerns on embodiment of this invention. The figure which showed the system configuration | structure of the content sharing system which concerns on Embodiment 2 of this invention. The flowchart which illustrated the content sharing process performed by DVC101 which concerns on Embodiment 2 of this invention

[Embodiment 1]
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, an example in which the present invention is applied to a digital video camera capable of functioning as a digital media server (DMS) defined by DLNA guidelines as an example of an electronic device will be described. To do. However, the present invention is applicable to any device that can function as a digital media server (DMS). In this embodiment, the digital media player (DMP) defined by the DLNA guidelines is described as being a digital television, but the implementation of the present invention is not limited to this.

<Configuration of content sharing system>
FIG. 1 is a diagram showing a system configuration of a content sharing system according to an embodiment of the present invention.

  A digital video camera (DVC) 101 functioning as a DMS has a wireless communication function based on, for example, the IEEE 802.11n standard, and is connected to a digital television (DTV) 102 via an access point (AP) 103. In the present embodiment, as shown in FIG. 1, the DTV 102 and the AP 103 are described as being connected in a wired manner so as to be communicable, and the DVC 101 and the AP 103 are wirelessly connected so as to be able to communicate with each other. Any method may be used. The DVC 101 functions as a DMS to publish media content such as still images, moving images, and audio recorded on a connected recording medium so as to be reproducible.

  The DTV 102 functioning as the DMP has a wired communication function compliant with, for example, the Gigabit Ethernet (registered trademark) standard, and is connected to the DVC 101 via the AP 103 so as to be communicable. The DTV 102 functions as a DMP, so that it can receive media content such as still images, moving images, and sounds released by the DVC 101 and reproduce them on the DTV 102.

<Configuration of DVC 101>
FIG. 2 is a block diagram showing a functional configuration of the DVC 101 according to the embodiment of the present invention. In the present embodiment, in order to distinguish the components included in each of the DVC 101 and the DTV 102, the components included in the DVC 101 will be described with the prefix “camera”.

  The camera control unit 201 is a CPU, for example. The camera control unit 201 controls the operation of each block included in the DVC 101. Specifically, the camera control unit 201 controls the operation of each block by reading a program recorded in the camera memory 202 and developing the program in a working memory on the camera memory 202 and executing it.

  The camera memory 202 includes a non-volatile memory and a volatile memory used for a working memory and the like included in the DVC 101. In addition to the operation program for each block of the DVC 101, the camera memory 202 stores information such as parameters necessary for the operation of each block in the nonvolatile memory. In addition, the volatile memory of the camera memory 202 is used not only as a program development area as in a normal working memory, but also as a storage area for temporarily storing intermediate data output in the operation of each block. .

  The camera operation unit 203 is a user interface included in the DVC 101 such as a menu button, a selection key, a touch panel sensor, and the like. When the camera operation unit 203 detects that an operation input has been made on various user interfaces, the camera operation unit 203 outputs a control signal corresponding to the operation to the camera control unit 201.

  The camera display unit 204 is a display device included in the DVC 101 such as an LCD or an organic EL display. The camera display unit 204 is used, for example, to display content recorded on a connected recording medium (not shown), and a GUI screen such as a content operation interface or a menu screen.

  The camera imaging unit 205 includes an imaging optical system, an imaging device such as a CCD or CMOS sensor, and a digital image processing unit. The camera imaging unit 205 performs an imaging process according to a shooting instruction and outputs image data related to shooting. Specifically, the camera imaging unit 205 photoelectrically converts an optical image formed on the imaging element surface via the imaging optical system, and generates an analog image signal. The camera imaging unit 205 applies A / D conversion processing to the obtained analog image signal to generate digital image data (captured image). The captured image generated by the camera imaging unit 205 is stored in the camera memory 202 and then displayed on the camera display unit 204 under the control of the camera control unit 201. When the camera control unit 201 issues a recording command, the captured image is recorded on a recording medium (not shown) by the camera recording unit 206. The camera imaging unit 205 has a lens control function, and controls zoom, focus, aperture adjustment, and the like of the imaging optical system in accordance with a control signal output from the camera control unit 201.

  The camera recording unit 206 controls writing of data to a recording medium (not shown) and reading of data recorded on the recording medium. In the present embodiment, the camera recording unit 206 records still image and moving image data output from the camera imaging unit 205 on a recording medium. The recording medium is not limited to an external recording device such as a memory card detachably connected to the DVC 101, and may be, for example, a built-in flash memory or a built-in hard disk.

  The camera communication unit 207 is a communication interface that the DVC 101 has. In the present embodiment, the camera communication unit 207 is configured to be able to transmit and receive data wirelessly as described above.

  A camera power management unit 208 manages power supply to each block of the DVC 101. In the present embodiment, the DVC 101 includes a power interface that connects an external power source such as a commercial power source and a power interface that connects an internal power source such as a battery for acquiring operating power. The camera power management unit 208 manages the connection state of the power interface and controls the power supply to each block. When the two power supply interfaces are both in a state where power can be supplied, the power supplied from the external power supply is preferentially used for the operation of each block.

  Each block of the DVC 101 is connected to each other via the camera bus 209 so that necessary communication is possible.

<Configuration of DTV 102>
FIG. 3 is a block diagram showing a functional configuration of the DTV 102 according to the embodiment of the present invention.

  The control unit 301 is a CPU, for example. The control unit 301 controls the operation of each block included in the DTV 102. Specifically, the control unit 301 controls the operation of each block by reading a program recorded in the memory 302 and developing the program in a working memory on the memory 302 and executing it.

  The memory 302 includes a volatile memory used as a non-volatile memory and a working memory included in the DTV 102. In addition to the operation program for each block of the DTV 102, the memory 302 stores information such as parameters necessary for the operation of each block in the nonvolatile memory. The volatile memory of the memory 302 is used not only as a program development area as in a normal working memory, but also as a storage area for temporarily storing intermediate data output in the operation of each block.

  The operation unit 303 is a user interface included in the DTV 102 such as a light receiving unit that receives an infrared signal transmitted by operating a power button, an input switching button, or a remote controller (not shown), for example. When the operation unit 303 detects that an operation input to various user interfaces has been performed, the operation unit 303 outputs a control signal corresponding to the operation to the control unit 301.

  The display unit 304 is a display device included in the DTV 102 such as an LCD or an organic EL display. The display unit 304 is used to display various contents received from the DVC 101, which is a DMS, via the communication unit 305, and GUI screens such as content operation interfaces and menu screens.

  The communication unit 305 is a communication interface that the DTV 102 has. In the present embodiment, the communication unit 305 is configured to be able to transmit and receive data with priority as described above.

  Each block included in the DTV 102 is connected to each other via a bus 306 so that necessary communication is possible.

《Content sharing processing》
A specific process of the content sharing process executed by the DVC 101 of the present embodiment having such a configuration will be described with reference to the flowchart of FIG. Note that this content sharing process will be described as being started when, for example, the user operates the DVC 101 in a mode that functions as a DMS after the user performs a power-on operation.

  In the content sharing process, it is assumed that the DVC 101 is in a state where the above-described recording medium is connected. It is assumed that the recording medium has a hierarchical structure by a predetermined file system and various recording data are recorded. In the present embodiment, as shown in FIG. 5, it is assumed that the “Media”, “Photo”, and “Thumb” folders are constructed in the Root hierarchy of the recording medium. At this time, a video file is stored in the Video folder, a still image file is stored in the Photo folder, and a still image file for thumbnail is stored in the Thumb folder.

  In step S401, the camera communication unit 207 establishes a wireless communication connection to the AP 103 as a DMS under the control of the camera control unit 201, and performs IP address setting processing and the like. At this time, the DVC 101 is connected to the DLNA network constructed via the AP 103.

  In step S <b> 402, the camera communication unit 207 multicasts a participation notification message to the connected devices (DLNA client) of the connected DLNA network under the control of the camera control unit 201. The participation notification message is defined by the DLNA guidelines, and is configured as shown in FIG. The DLNA client on the network can recognize that the DVC 101 has joined the DLNA network by receiving the message.

  In step S <b> 403, the camera control unit 201 determines whether a content list request message or a content transmission request message is received from the DMP (DTV 102 in the present embodiment) on the DLNA network. Specifically, the camera control unit 201 determines this step according to whether the camera communication unit 207 receives any message from the DMP. If the camera control unit 201 determines that a content list request message has been received, the process proceeds to S404. If the camera control unit 201 determines that a content transmission request message has been received, the process proceeds to S408. If the camera control unit 201 determines that no message has been received, the process of this step is repeated.

  In step S404, the camera control unit 201 determines whether the DVC 101 is currently being driven by an internal power source or an external power source. Specifically, the camera control unit 201 acquires information on the current power supply state from the camera power management unit 208, and performs the determination in this step. If the camera control unit 201 determines that the DVC 101 is currently driven by the internal power supply, it moves the process to S405. If it determines that the DVC 101 is driven by the external power supply, it moves the process to S406.

  In step S405, the camera control unit 201 generates a content list including dummy content for power control. The content list is a list of contents that can be provided by the DVC 101 functioning as the DMS. In the present embodiment, a list of still image files, moving image files, and the like recorded on a recording medium connected to the DVC 101 is displayed. It has become. The content list is defined in the DLNA guidelines, and is described by being hierarchized in the XML format as shown in FIG. In the content list, for each content (container, item), a display name when the list is generated and displayed in DMP, a file (item only) displayed when selected, and a thumbnail image displayed on the list Is described. Specifically, each content in the content list includes a <res> tag including a URL for obtaining a thumbnail file and a JPEG_TN parameter indicating that the file is a thumbnail file for displaying a thumbnail. Each item has a <res> tag describing a URL for acquiring content data when selected.

  The content list generated in this step may be as shown in FIG. 7A, for example, and is generated for each layer of the recording medium. FIG. 7A shows a content list generated for the highest layer of the DMS, that is, the root layer of the recording medium. In FIG. 7A, 701 describes a video container for moving image content (corresponding to a video folder), and 702 describes a photo container for still image content (corresponding to a photo folder).

  In this embodiment, when the DVC 101 is driven by an internal power supply, the camera control unit 201 includes a content list including information on dummy content for the purpose of power control (power off) only when there is no corresponding media content. Is generated. Reference numeral 703 in FIG. 7A denotes a description indicating an item corresponding to the dummy content. The description of the dummy content may be included in all the content lists generated for each layer so that it can be accessed from any layer (folder). For example, the content list corresponding to the Photo folder in FIG. 5 includes dummy contents in addition to the corresponding item descriptions 704 and 705 of the still image files “100-0001” and “100-0002” as shown in FIG. 7B. A corresponding item description 706 is included. In this way, the DMP user can select the item of the dummy content for power control on the screen corresponding to the content list of each layer, thereby transmitting the request for power control to the DVC 101 which is the DMS. Can do.

  On the other hand, if it is determined in S404 that the DVC 101 is driven by an external power supply, the camera control unit 201 generates a content list that does not include power supply control dummy content in S406. The content list generated in this step is, for example, as shown in FIG. 8A for the highest hierarchy of DMS and as shown in FIG. 8B for the Photo folder. That is, when the DVC 101 is driven by an external power source, the power of the internal power source is not consumed, so that it is considered unnecessary to perform power control from the DMP in consideration of the remaining power amount of the internal power source. Therefore, in the present embodiment, the content list shown in FIG. 8 does not include the description of the corresponding item of the dummy content for power control included in the content list of FIG.

  In step S407, the camera control unit 201 transmits the generated content list to the camera communication unit 207, causes the content list request message to be transmitted to the DMP, and returns the process to step S403. The transmitted content list is interpreted by the DMP and displayed as a corresponding list screen. For example, the list screen corresponding to FIG. 7A is as shown in FIG. 9A, and the list screen corresponding to FIG. 7B is as shown in FIG. 9B. For example, the list screen corresponding to FIG. 8A is as shown in FIG. 10A, and the list screen corresponding to FIG. 8B is as shown in FIG.

  On the other hand, if it is determined in S403 that a content transmission request message has been received, the camera control unit 201 determines in S408 whether the content requested to be transmitted is dummy content for power control. Specifically, the camera control unit 201 determines whether the received transmission request message includes information for specifying dummy content (request file URL is http://192.168.1.21:18080/PowerOff). If the camera control unit 201 determines that the content requested to be transmitted is dummy content for power control, the process proceeds to S409. If the content is determined to be other content, the process proceeds to S412.

  In step S <b> 409, the camera control unit 201 generates image data notifying that a request for power-off has been received, and transmits the image data to the DMP that transmitted the transmission request message via the camera communication unit 207. For example, the image data generated in this step may be as shown in FIG.

  In step S410, the camera communication unit 207 multicasts a disconnection notification message to the connected devices (DLNA client) of the connected DLNA network under the control of the camera control unit 201. The leave notification message is defined by the DLNA guidelines, and is configured as shown in FIG. 6B, for example. The DLNA client on the network can recognize that the DVC 101 has left the DLNA network by receiving the message.

  In step S411, the camera power management unit 208 stops power supply to each block of the DVC 101 under the control of the camera control unit 201, and turns off the power of the DVC 101 main body.

  On the other hand, if it is determined in S408 that a transmission request for content other than the power control dummy content has been made, the camera control unit 201 transmits the corresponding content data to the camera communication unit 207 in S412 and makes a request. Send to DMP. Specifically, the camera control unit 201 controls the camera recording unit 206 to read corresponding content data from the recording medium, transmit the data to the camera communication unit 207, and cause the camera communication unit 207 to transmit the data. When the data transmission is completed, the camera control unit 201 returns the process to S403.

  In this way, in the content sharing system of the present embodiment, when the DVC 101 that is a DMS is not operating with an external power supply, the power control of the DVC 101 by DMP becomes possible.

  In the present embodiment, the power control of the DVC 101 that can be performed by the DMP has been described as a power-off operation. However, the embodiment of the present invention is not limited to this. The power control that can be performed by the DMP may be, for example, a transition operation to a power saving function that stops power supply to a block related to a process of causing the DVC 101 to function as a DMS. That is, the power control function of the DMS provided to the DMP in the implementation of the present invention may be anything that aims to reduce (limit) the power consumption and power supply amount in the DMS.

  In the present embodiment, the content list is configured so that the power supply can be controlled only when the DVC 101 is not operating with an external power supply. However, the embodiment of the present invention is not limited thereto. That is, the DMS power control function provided to the DMP in the implementation of the present invention may be possible even when the DMS is operated by an external power source. Further, for example, when the DMS is operated by an external power source, the power supply to the block related to the process to function as the DMS is stopped, and when the DMS is not operated by the external power source, the power source of the DMS is turned off. The control function may be divided according to the supply state.

  Further, an event message notifying that the power supply state has changed may be transmitted to each DLNA client connected to the DLNA network in response to switching of the operating power of the DMS. Specifically, it is possible to notify a change in the state of the DMS by issuing and transmitting an event message defined in the DLNA standard to the GENA protocol. In this case, for example, when the DMP receives the state change message, the DMP is configured to issue the content list request message again, so that the power control content is compulsorily when the DMS is not operating with an external power source. May be displayed.

  As described above, the electronic device of the present embodiment can provide a power control function to a device that shares media content via a network. Specifically, when the operating power of the electronic device is not an external power source, the electronic device generates a list in addition to the content that can provide power control content, and transmits the list to the external device. The electronic device controls power supply in the electronic device when the transmission request received from the external device based on the list is a transmission request for content for power control.

[Modification 1]
In the first embodiment described above, when the DVC 101 functions as a DMS while being driven by an internal power supply, the DVC 101 generates a list including a description of a dummy content item for power control whenever a content list is requested. The manner of returning them was explained. However, considering realistic use, it is conceivable that the user who activates the DVC 101 that is the DMS and the user who browses the content using the DTV 102 that is the DMP are the same. That is, when the user causes the DVC 101 to function as the DMS and the user operates the DTV 102 to display the content list screen, an item for turning off the power of the DVC 101 is displayed from the beginning. It will be. That is, for example, when an item for power control is selected due to an erroneous operation, the DVC 101 may be turned off without the user browsing the content.

  For this reason, the camera control unit 201 includes a description of the dummy content item in the content list provided to the DMP that transmitted the transmission request message until, for example, the content is transmitted a predetermined number of times, preferably at least once. It may not be possible.

[Modification 2]
In the first embodiment described above, the DVC 101 has been described as starting the operation of turning the power off when receiving a transmission request message for the dummy content for power control. However, the user may select an item for power control due to an erroneous operation.

  For this reason, when receiving a transmission request message for dummy content for power control, the camera control unit 201 generates image data for confirmation as shown in FIG. 11B and transmits it to the DMP. You may be prompted for final confirmation. The list screen of FIG. 11B prompts the user to select an item for power control from the list screen again when the DVC 101 is turned off. In this case, the camera control unit 201 starts the operation to turn off the power supply only when receiving a transmission request message for the power control dummy content continuously from the corresponding DMP a predetermined number of times. The management unit 208 may be controlled.

[Embodiment 2]
In the first embodiment and the modification described above, as shown in FIG. 1, a mode in which one DTV 102 functioning as a DMP is connected to a DVC 101 functioning as a DMS, that is, a mode in which only the DTV 102 is connected to the DVC 101. explained. In the aspect of the first embodiment, the user can operate to turn off the power of the DVC 101 after reproducing the shared content using the DTV 102. However, since the DMS on the DLNA network is usually configured to be able to provide content to a plurality of DMPs, when one DMP user performs control to turn off the DMS, other DMP users May interfere with the browsing of content. In this embodiment, a mode for providing a suitable browsing environment when DMS provides content to a plurality of DMPs in a DLNA network will be described.

<Configuration of content sharing system>
FIG. 12 shows a system configuration of the content sharing system according to the present embodiment.

  In addition to the configuration of the first embodiment, the content sharing system of the present embodiment includes a digital television (DTV) 1201 that is wired to the AP 103. In this embodiment, the DTV 1201 will be described as having the same configuration as the DTV 102. The DTV 1201 functions as a DMP, so that it can receive media content such as still images, moving images, and sounds published by the DVC 101 and reproduce them on the DTV 1201.

《Content sharing processing》
Hereinafter, specific processing of content sharing processing executed in the DVC 101 of this embodiment will be described with reference to the flowchart of FIG. Note that this content sharing process will be described as being started when, for example, the user operates the DVC 101 in a mode that functions as a DMS after the user performs a power-on operation. Further, in this content sharing process, steps that perform the same processing as the content sharing process of the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only characteristic steps of the present embodiment are described.

  If it is determined in step S403 that a content list request message has been received, the camera control unit 201 in step S1301, for example, indicates information indicating whether or not processing related to content list transmission stored in the camera memory 202 is being executed. Set during execution. The information indicating whether or not the processing related to content list transmission is being executed may be, for example, logical information (content list processing flag), and indicates that the processing is being executed when the value is true. It may be information. The camera control unit 201 sets the information indicating whether or not the process related to the content list transmission is being executed, and then moves the process to S404.

  In step S <b> 407, after the content list is transmitted to the camera communication unit 207, the camera control unit 201 sets information indicating whether or not processing related to content list transmission is being stopped in step S <b> 1302, and performs processing. Return to S403. For example, the value of the content list processing flag is set to false.

  If it is determined in S408 that a transmission request for content other than the power supply control content has been made, the camera control unit 201 sets in S1303 information indicating whether or not processing related to content transmission is being executed. To do. Information indicating whether or not processing related to content transmission is being executed may be, for example, logical type information (content processing flag) stored in the camera memory 202, and is being executed when the value is true. It may be information indicating. The camera control unit 201 sets information indicating whether or not processing related to content transmission is being executed, and then moves the process to S412.

  In step S412, after the content data requested to be transmitted is transmitted to the camera communication unit 207, in step S1304, the camera control unit 201 sets information indicating whether or not the processing related to content transmission is being executed. Then, the process returns to S403. For example, the value of the content processing flag is set to false.

  On the other hand, when it is determined in S408 that the content requested to be transmitted is the power supply control content, the camera control unit 201 determines in S1305 whether the processing related to content list transmission or content transmission is being executed. Specifically, the camera control unit 201 refers to information indicating whether or not processing related to content list transmission is being executed and information indicating whether or not processing related to content transmission is being executed. It is determined whether or not such processing is being executed. If the camera control unit 201 determines that any process is being executed, the process proceeds to S409. If the camera control unit 201 determines that any process is not being executed, the process proceeds to S1306.

  In step S <b> 1306, the camera control unit 201 generates screen data notifying that power control is not possible because the process is being executed, and for the DMP that has transmitted the transmission request message via the camera communication unit 207. Transmit, and the process returns to S403. For example, the image data generated in this step may be as shown in FIG.

  By doing so, in the DVC 101 of this embodiment, at least when processing related to data transmission is executed in response to a request from the DMP of the DLNA network, control related to power control from any DMP on the network It is possible not to accept instructions. In the present embodiment, it has been described that the control command related to the power supply control is not accepted only when the processing related to content list transmission or content transmission is executed in the DVC 101. However, the embodiment of the present invention is not limited to this. It is not limited to. For example, when a request for a content list is made, it is assumed that a content transmission request is continuously made from the DMP displaying the corresponding screen of the content list. For this reason, the camera control unit 201 does not accept a control command related to power control for a predetermined period after the content list or content is transmitted last, not only during execution of processing related to content list or content transmission. It may be.

[Other Embodiments]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (9)

An electronic device that transmits a list of contents that can be provided to an external device and receives a content transmission request from the external device based on the list,
Generating means for generating the list;
Communication means for transmitting the list generated by the generating means and receiving the transmission request;
Determining means for determining an operating power supply of the electronic device;
Control means for controlling power supply in the electronic device,
The generation unit generates the list in addition to the content that can be provided, in addition to the content that can be provided, when the operating power source determined by the determination unit is not an external power source,
The electronic device according to claim 1, wherein the control unit controls power supply in the electronic device when the transmission request received by the communication unit is a transmission request for the content for power control.   The electronic device according to claim 1, wherein the control unit limits a power supply amount in the electronic device when the transmission request is a transmission request for the content for power control. The list is transmitted in response to a transmission request for the list from an external device,
3. The electronic device according to claim 1, further comprising notification means for notifying an external device that a change has occurred in the list when the operating power of the electronic device is changed by the determination means. The electronic device described. The communication means further transmits a content corresponding to the requested external device when receiving a transmission request for any of the contents that can be provided,
The generation unit is configured to output the power source when the operation power source determined by the determination unit is not an external power source and the number of times content is transmitted to an external device that transmits the list exceeds a predetermined number. 4. The electronic apparatus according to claim 1, wherein control content is added to the list.   5. The control unit according to claim 1, wherein the control unit controls power supply in the electronic device when a transmission request for the power control content is continuously received a predetermined number of times. The electronic device as described in the paragraph. The communication means further transmits a content corresponding to the requested external device when receiving a transmission request for any of the contents that can be provided,
The control unit does not control power supply even when a transmission request for the power control content is received during execution of processing related to transmission of the list or the corresponding content. The electronic device according to any one of 1 to 5. The list is generated for each level of the available content managed according to a hierarchical structure,
7. The power generation control content according to claim 1, wherein when the operating power supply is not an external power supply, the generation unit adds the power control content to any of the lists generated for each layer. 8. The electronic device described. A method of controlling an electronic device that transmits a list of contents that can be provided to an external device and receives a content transmission request from the external device based on the list,
A generating step in which the electronic device generating means generates the list;
A communication step in which the communication means of the electronic device transmits the list generated in the generation step and receives the transmission request;
A determination step in which the determination unit of the electronic device determines an operating power source of the electronic device;
The control means of the electronic device has a control step of controlling power supply in the electronic device,
In the generating step, the generating means generates the list by adding content for power supply control to the content that can be provided when the operating power source determined in the determining step is not an external power source,
In the control step, the control unit controls power supply in the electronic device when the transmission request received in the communication step is a transmission request for content for power control. Control method.   The program for functioning a computer as each means of the electronic device of any one of Claims 1 thru | or 7.

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